Making master-plates.



H. MoPHEE. I MAKING MASTER PLATES. APPLIUATION FILED JUNE 16, 1910.

976,897. Patented Nov. 29, 1910.

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H. MQPHEE.

I MAKING MASTER PLATES. APPLIUATIOIT FLED T11R15, 1910. 97 ,397,Patented Nov. 29, 1910.

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jmlmze l 1 THE NORRIS PETERS (20., WAsl-uuc'row n c UNITED STATES PATENTOFFICE.

HUGH MOPHEE, OF TARRYTOWN, NEW YORK.

MAKING MASTER-PLATES.

To all whom it may concern.

Be it known that I, HUGH MCPHEE, citizen of the United States, residingat Tarrytown, in the county of WVestchester and State of New York, haveinvented certain new and useful Improvements in the Method of MakingMaster-Plates; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to an improvement in the process or method ofmaking perma nent master plates to be used in connection with the copeand nowel of a two-part flask. My method of making master plates isparticularly adapted for a multiple of small patterns that, from theirpeculiar shape, it is practically impossible to locate on ordinary oastiron master plates. I employ first a master pattern of wood or othersuitable material and form impressions or molds in a twopart flask, andthen pour pattern metal into each separate individual mold so as toinsure a uniform shrinkage in each mold of the cope and nowel. After themetal has cooled, a skeleton master plate is placed on the cope andnowel and filled with a non-shrinkable material to which the metalpatterns will adhere when the said material ardens. The master platesthus formed are used to mold from and will last indefinitely.

Referring to the drawings: Figure 1 rep resents an upper plan View of aflask set up for forming molds from the master patterns; Fig. 2 is aside elevation of the flask; Fig. 3 is a sectional view of the flask online a a of Fig. 1, showing the molds formed by the master patterns;Fig. 4 is an n per detail plan view of one-half of the ask showing thedepressions or molds in the sand formed by the master patterns; Fig. 5is a similar View of the other half of the flask; Fig. 6 is a detailplan view of one of the skeleton master plates; Fig. 7 represents one ofthe master plates overlying one part of the flask and filled withnonshrinkable material; Fig. 8 represents the position of one of themaster plates and one part of the flask when molds are made in the flaskby the working patterns on the master plate; Fig. 9 is a detail insideplan view of one of the master plates with the working patterns securedthereto; Fig. 10 is a detail side elevation of one of the master plateslooking in the direction of arrow 0 Specification of Letters Patent.

Application filed June 15, 1910.

Patented Nov. 29, 1910. Serial No. 566,904.

of Fig. 9; Fig. 11 is a detail inner plan view of the other finishedmaster plate; Fig. 12 is an enlarged broken sectional view of the masterplate on line 6 Z) of Fig. 9; Fig. 13 is an enlarged broken sectionalview of the master plate on line 0 c of Fig. 11; Fig. 14 is an enlargeddetail view of the master pattern; Fig. 15 is an enlarged detail sideelevation of the master attern; and Fig. 16 is a side elevation showingthe cope and nowel of the flask and the interposed master plates.

Like figures of reference indicate like parts throughout the severalviews.

In forming master plates from my improved method, it is essential thatthe cope l and nowel 2 of the flask should accurately register with eachother, and one master plate should register with the cope and the othermaster plate with the nowel, or each master plate can be made toregister, if de sired, with either the cope or nowel. The cope 1 has theholes 4, 5, 6 and 7 to admitthe pins 8, 9, 10 and 11 of the nowel 2 whenthe cope and nowel are put together. When the master plate 12, Fig. 9,is laid on thecope 1, the pins 13, 14, 15 and 16 will enter the holes17, 18, 19 and 20 of the cope. In like manner the pins 21, 22, 23 and 24of the master plate 25, Fig. 11, will enter the holes 26, 27, 28 and 29of the nowel shown at Fig. 5.

The first step in forming the master plates is to ram up the masterpattern 3 in the cope 1 and nowel 2 in the usual manner to form themolds 30 in the cope, as shown at Fig. 3 and 4. As this particularmaster pattern has the depressions 3*, Fig. 14, there will also beformed the corresponding circular elevations 31, Figs. 3 and 5, in thenowel. The parting line is represented by the dotted line d, as shown atFigs. 12 and 15, so that an impression of the entire head portion of thepattern and one-half of the stem 3 will be in the cope.

When the cope is removed, as shown at Fig. 4, the anchorage pins 32 areinserted in the molds or impressions 30 and allowed to stand above thesurface of the cope so as to project well into the master plate when assembled to the cope. Previous, however, to the placin of the masterplateon the cope, each of t e depressions or molds 30 are filled withpattern metal, pouring the molten metal into each mold separately andflush with the parting line, then the gate 33 is formed in the sand inthe usual manner. The master plate 12, which is now a skeleton as shownat Fig. 6, is placed on the cope as shown at Fig. 7 and filled with thenonshrinkable material 84 which is'poured into said palte in asemi-liquid state. When this material has hardened sufficiently, themaster plate is removed and with it also the raised metal workingpatterns 35, Fig. 9, firmly anchored to the binding material by thebeforementioned pins 32, as shown at Figs. 9, l0 and 12. After thebinding material is poured into the skeleton master plates it should beallowed to set for a few moments before removing the plates from theflask. As soon as the material is set, the plates are removed and thesand washed off and they are placed in a temperature where they will dryout thoroughly.

The principal feature of my improved method is to form the workingpatterns of metal and the filler for the master plate of a basermaterial for the reason that if the master plate was filled with thesame metal, or, in other words, if instead of first pouring the patternmetal into each mold separately as before described, the molds in thecope and the openings in the master plate were filled atthe same timeand with the same pattern metal, the shrinkage in such a body of metalwould be so unequal that the castings made from the separate masterplates in the cope and nowel would overlap and not match, and thus makean imperfect cast-' ing. This would be particularly the case with thosecastings located or formed from the central group of working patterns,as these patterns would be the last to cool. But when each mold ispoured separately, each working pattern will naturally shrink evenlytoward its own center and will not be influenced by the shrinkage of therest. The depression 33, F ig., 4, made in the sand of the cope, asbefore mentioned, will result in forming the ridge 36, Fig. 10, whichridge will form agate in the sand of the scope when the master platewith its working patterns is located thereon to obtain castingstherefrom.

With this particular master pattern shown, there will be nothing toproject above the match face of the master plate 25, as the elevationsin the nowel 2, Figs. 3 and 5, will form the depressions 37, Figs. 11and 13, so that when this master plate is placed on the nowel the sandwill be forced therein and act as a core, so that, in this particularcase, this master plate will simply be filled with the same material asbefore described for the master plate 12. When, however, a masterpattern is so constructed as to form molds in both cope and nowel, thenthe molds in both cope and nowel will be separately filled with themolten pattern metal as before described for the master plate 12.

The integral cross bars 38 of the master plates not only add strength tothe skeleton plates, but they also serve as an additional anchorage forthe filling material 84, which when hardened forms practically a solidplate, The master plates thus formed are equally adapted for bench ormachine moldmg.

Having thus described my invention, what I claim is l. The hereindescribed method of making master plates which consists in first forminga mold from a master pattern in a two-part flask comprising a cope andnowel, then pouringapattern metal into each separate and individual moldthus formed and flush with the parting line to form, when cooled,working patterns, then place a skeleton master plate over the cope andnowel and fill said plates with a non-shrinkable material and allow itto set, then remove the master plates with the working patterns firmlysecured to the said material and allow said material to becomethoroughly hardened.

2. The herein described method of making master pattern plates whichconsists in first forming a mold from a master pattern in a two-partflask and insert anchorage pins in the mold, then pouring pattern metalinto each separate and individual mold thus formed and flush with theparting line to form, when cooled, working patterns, then place askeleton master plateover one-half of the separated flask and fill saidskeleton plate -with a non-shrinkable material with the anchorage pinsembedded therein, allow the material to set, then-remove the patternplate with the working patterns firmly anchored thereto and allow saidmaterial to become thoroughly hardened before using the master plate.

In testimony whereof I aifiX my signature in presence of two witnesses.

HUGH MoPHEE.

Witnesses:

FREDK H. BEoKWITH, E. Moss JACKSON.

